Mahabharata 1.3.174

1.3.174

ya ṛṣabhastvayā pathi gacchatā dṛṣṭaḥ sa airāvato nāgarājaḥ |
yaścainamadhirūḍhaḥ sa indraḥ |
yadapi te purīṣaṃ bhakṣitaṃ tasya ṛṣabhasya tadamṛtam || 174 ||

"And his preceptor thus addressed said unto him, 'The two damsels thou hast seen are Dhata and Vidhata; the black and white threads denote night and day; the wheel of twelve spokes turned by the six boys signified the year comprising six seasons. The man is Parjanya, the deity of rain, and the horse is Agni, the god of fire. The bull that thou hast seen on the road is Airavata, the king of elephants; the man mounted thereon is Indra; and the dung of the bull which was eaten by thee was Amrita. It was certainly for this (last) that thou hast not met with death in the region of the Nagas; and Indra who is my friend having been mercifully inclined showed thee favour. It is for this that thou returnest safe, with the ear-rings about thee. Then, O thou amiable one, I give thee leave to depart. Thou shall obtain good fortune.'